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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Executive Officers |
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
(Not in thousands) | Shares |  | Weighted-average grant date fair value
Non-vested at January 1, 2016 | 495,731 | $ | 28.25
Granted | 344,488 |  | 25.86
Performance Shares Quantity Adjustment | 39,566 |  | 24.37
Vested | (487,784) |  | 27.72
Forfeited | (8,019) |  | 29.13
Non-vested at December 31, 2016 | 383,982 | $ | 26.35
Granted | 212,200 |  | 42.57
Performance Shares Quantity Adjustment | (232,989) |  | 29.10
Vested | (67,853) |  | 48.54
Non-vested at December 31, 2017 | 295,340 | $ | 30.75
Granted | 239,062 |  | 45.81
Performance Shares Quantity Adjustment | 234,076 |  | 33.09
Vested | (372,271) |  | 35.83
Forfeited | (14,021) |  | 37.35
Non-vested at December 31, 2018 | 382,186 | $ | 36.41
Directors |
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
(Not in thousands) | Restricted stock |  | Weighted-average grant date fair value
Non-vested at January 1, 2016 | - |  | -
Granted | 40,517 | $ | 29.77
Vested | (40,517) |  | 29.77
Forfeited | - |  | -
Non-vested at December 31, 2016 | - |  | -
Granted | 25,771 | $ | 38.42
Vested | (25,771) |  | 38.42
Forfeited | - |  | -
Non-vested at December 31, 2017 | - |  | -
Granted | 25,159 | $ | 46.71
Vested | (25,159) |  | 46.71
Forfeited | - |  | -
Non-vested at December 31, 2018 | - |  | -

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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